<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .container {}

        .container .cart {
            width: 300px;
            margin: auto;
        }

        .container .title {
            background-color: lightblue;
            height: 40px;
            line-height: 40px;
            text-align: center;
            /*color: #fff;*/
        }

        .container .total {
            background-color: #FFCE46;
            height: 50px;
            line-height: 50px;
            text-align: right;
        }

        .container .total button {
            margin: 0 10px;
            background-color: #DC4C40;
            height: 35px;
            width: 80px;
            border: 0;
        }

        .container .total span {
            color: red;
            font-weight: bold;
        }

        .container .item {
            height: 55px;
            line-height: 55px;
            position: relative;
            border-top: 1px solid #ADD8E6;
        }

        .container .item img {
            width: 45px;
            height: 45px;
            margin: 5px;
        }

        .container .item .name {
            position: absolute;
            width: 90px;
            top: 0;
            left: 55px;
            font-size: 16px;
        }

        .container .item .change {
            width: 100px;
            position: absolute;
            top: 0;
            right: 50px;
        }

        .container .item .change a {
            font-size: 20px;
            width: 30px;
            text-decoration: none;
            background-color: lightgray;
            vertical-align: middle;
        }

        .container .item .change .num {
            width: 40px;
            height: 25px;
        }

        .container .item .del {
            position: absolute;
            top: 0;
            right: 0px;
            width: 40px;
            text-align: center;
            font-size: 40px;
            cursor: pointer;
            color: red;
        }

        .container .item .del:hover {
            background-color: orange;
        }
    </style>
</head>

<body>
    <ol>
        <li>组件化开发：项目结构为一个父组件，下面挂三个子组件</li>
        <li>父组件向子组件传递数据：v-bind </li>
        <li>子组件接受父组件的数据：props 使用组件的计算属性计算总价 </li>
        <li>删除功能的实现：子组件向父组件传递数据 使用 $emit() 触发 使用$event 接受参数值 </li>
    </ol>
    <div id="app">
        <div class="container">
            <my-cart></my-cart>
        </div>
    </div>
    <script type="text/javascript" src="js/vue.js"></script>
    <script type="text/javascript">
        var CartTitle = {
            props: ['title'],
            template: `
        <div class="title">{{title}}的商品</div>
      `
        }
        var CartList = {
            props: ['list'],
            template: `
        <div>
          <div class="item" v-for='item in list' :key='item.id'>
            <img :src="item.img"/>
            <div class="name">{{item.name}}</div>
            <div class="change">
              <a href="">－</a>
              <input type="text" class="num" />
              <a href="">＋</a>
            </div>
            <div class="del" @click='$emit("del",item.id)'>×</div>
          </div>
          
        </div>
      `
        }
        var CartTotal = {
            props: ['list'],
            computed: {
                total: function () {
                    var t = 0
                    this.list.forEach(element => {
                        t += element.price * element.num
                    });
                    return t
                }
            },
            template: `
        <div class="total">
          <span>总价：{{total}}</span>
          <button>结算</button>
        </div>
      `
        }
        Vue.component('my-cart', {
            data() {
                return {
                    title: '张三',
                    list: [{
                        id: 1,
                        name: 'TCL彩电',
                        price: 1000,
                        num: 1,
                        img: 'img/a.jpg'
                    }, {
                        id: 2,
                        name: '机顶盒',
                        price: 1000,
                        num: 1,
                        img: 'img/b.jpg'
                    }, {
                        id: 3,
                        name: '海尔冰箱',
                        price: 1000,
                        num: 1,
                        img: 'img/c.jpg'
                    }, {
                        id: 4,
                        name: '小米手机',
                        price: 1000,
                        num: 1,
                        img: 'img/d.jpg'
                    }, {
                        id: 5,
                        name: 'PPTV电视',
                        price: 1000,
                        num: 2,
                        img: 'img/e.jpg'
                    }]
                }
            },
            template: `
        <div class='cart'>
          <cart-title :title='title'></cart-title>
          <cart-list :list='list' @del='del($event)'></cart-list>
          <cart-total :list='list'></cart-total>
        </div>
      `,
            components: {
                'cart-title': CartTitle,
                'cart-list': CartList,
                'cart-total': CartTotal
            },
            methods: {
                del: function (val) {
                    console.log(val)
                    var index = this.list.findIndex((item) => {
                        return item.id == val
                    })
                    this.list.splice(index, 1)
                }
            },
        });
        var vm = new Vue({
            el: '#app',
            data: {

            }
        });
    </script>
</body>

</html>